@Lucy_B, the issue is not, as far as I am aware, account specific and the request for screenshot will just result in images similar to that posted earlier here.
FYI: browser's console shows the following error when this issue occurs:
1 precore.js:9 requirejs Cannot read property 'ERRORS' of undefined Arguments [TypeError: Cannot read property 'ERRORS' of undefined
2 at new d (eval at runCode (https://mail2.…, callee: (...), Symbol(Symbol.iterator): ƒ]
3 requirejs.onError @ precore.js:9
4 j @ boot.js:10
5 check @ boot.js:10
6 enable @ boot.js:10
7 init @ boot.js:10
8 (anonymous) @ boot.js:10
9 setTimeout (async)
10 require.nextTick @ boot.js:11
11 f @ boot.js:10
12 requirejs @ boot.js:10
13 window.require @ boot.js:16
14 getModelType @ VM20112:9
15 d @ VM20110:9
16 createView @ VM20110:9
17 s.map.s.collect @ boot.js:4
18 s.<computed> @ boot.js:4
19 createSlides @ VM20110:9
20 render @ VM20110:9
21 render @ VM20109:5
22 initialize @ VM20109:5
23 b.View @ boot.js:5
24 constructor @ precore.js:15
25 N.d @ boot.js:5
26 (anonymous) @ boot.js:15
27 k @ boot.js:2
28 fireWith @ boot.js:2
29 e.<computed> @ boot.js:2
30 execCb @ boot.js:10
31 check @ boot.js:10
32 enable @ boot.js:10
33 init @ boot.js:10
34 (anonymous) @ boot.js:10
35 setTimeout (async)
36 require.nextTick @ boot.js:11
37 f @ boot.js:10
38 requirejs @ boot.js:10
39 window.require @ boot.js:16
40 c @ boot.js:15
41 launch @ boot.js:15
42 eval @ VM20108:1
43 (anonymous) @ precore.js:11
44 k @ boot.js:2
45 fireWith @ boot.js:2
46 e.<computed> @ boot.js:2
47 (anonymous) @ boot.js:2
48 k @ boot.js:2
49 fireWith @ boot.js:2
50 e.<computed> @ boot.js:2
51 execCb @ boot.js:10
52 check @ boot.js:10
53 enable @ boot.js:10
54 init @ boot.js:10
55 (anonymous) @ boot.js:10
56 setTimeout (async)
57 require.nextTick @ boot.js:11
58 f @ boot.js:10
59 requirejs @ boot.js:10
60 window.require @ boot.js:16
61 (anonymous) @ precore.js:2
62 multiple @ precore.js:11
63 j @ precore.js:7
64 f @ precore.js:3
65 dispatch @ boot.js:2
66 q.handle @ boot.js:2
67 precore.js:9 requirejs Cannot read property 'ERRORS' of undefined Arguments [TypeError: Cannot read property 'ERRORS' of undefined
68 at new d (eval at runCode (https://mail2.…, callee: (...), Symbol(Symbol.iterator): ƒ]
69 requirejs.onError @ precore.js:9
70 j @ boot.js:10
71 check @ boot.js:10
72 enable @ boot.js:10
73 init @ boot.js:10
74 (anonymous) @ boot.js:10
75 setTimeout (async)
76 require.nextTick @ boot.js:11
77 f @ boot.js:10
78 requirejs @ boot.js:10
79 window.require @ boot.js:16
80 getModelType @ VM20112:9
81 d @ VM20110:9
82 createView @ VM20110:9
83 s.map.s.collect @ boot.js:4
84 s.<computed> @ boot.js:4
85 createSlides @ VM20110:9
86 render @ VM20110:9
87 render @ VM20109:5
88 initialize @ VM20109:5
89 b.View @ boot.js:5
90 constructor @ precore.js:15
91 N.d @ boot.js:5
92 (anonymous) @ boot.js:15
93 k @ boot.js:2
94 fireWith @ boot.js:2
95 e.<computed> @ boot.js:2
96 execCb @ boot.js:10
97 check @ boot.js:10
98 enable @ boot.js:10
99 init @ boot.js:10
100 (anonymous) @ boot.js:10
101 setTimeout (async)
102 require.nextTick @ boot.js:11
103 f @ boot.js:10
104 requirejs @ boot.js:10
105 window.require @ boot.js:16
106 c @ boot.js:15
107 launch @ boot.js:15
108 eval @ VM20108:1
109 (anonymous) @ precore.js:11
110 k @ boot.js:2
111 fireWith @ boot.js:2
112 e.<computed> @ boot.js:2
113 (anonymous) @ boot.js:2
114 k @ boot.js:2
115 fireWith @ boot.js:2
116 e.<computed> @ boot.js:2
117 execCb @ boot.js:10
118 check @ boot.js:10
119 enable @ boot.js:10
120 init @ boot.js:10
121 (anonymous) @ boot.js:10
122 setTimeout (async)
123 require.nextTick @ boot.js:11
124 f @ boot.js:10
125 requirejs @ boot.js:10
126 window.require @ boot.js:16
127 (anonymous) @ precore.js:2
128 multiple @ precore.js:11
129 j @ precore.js:7
130 (anonymous) @ precore.js:13
131 dispatch @ boot.js:2
132 q.handle @ boot.js:2
133 precore.js:9 requirejs Cannot read property 'ERRORS' of undefined Arguments [TypeError: Cannot read property 'ERRORS' of undefined
134 at new d (eval at runCode (https://mail2.…, callee: (...), Symbol(Symbol.iterator): ƒ]
135 requirejs.onError @ precore.js:9
136 j @ boot.js:10
137 check @ boot.js:10
138 enable @ boot.js:10
139 init @ boot.js:10
140 (anonymous) @ boot.js:10
141 setTimeout (async)
142 require.nextTick @ boot.js:11
143 f @ boot.js:10
144 requirejs @ boot.js:10
145 window.require @ boot.js:16
146 getModelType @ VM20112:9
147 d @ VM20110:9
148 createView @ VM20110:9
149 s.map.s.collect @ boot.js:4
150 s.<computed> @ boot.js:4
151 createSlides @ VM20110:9
152 render @ VM20110:9
153 render @ VM20109:5
154 initialize @ VM20109:5
155 b.View @ boot.js:5
156 constructor @ precore.js:15
157 N.d @ boot.js:5
158 (anonymous) @ boot.js:15
159 k @ boot.js:2
160 fireWith @ boot.js:2
161 e.<computed> @ boot.js:2
162 execCb @ boot.js:10
163 check @ boot.js:10
164 enable @ boot.js:10
165 init @ boot.js:10
166 (anonymous) @ boot.js:10
167 setTimeout (async)
168 require.nextTick @ boot.js:11
169 f @ boot.js:10
170 requirejs @ boot.js:10
171 window.require @ boot.js:16
172 c @ boot.js:15
173 launch @ boot.js:15
174 eval @ VM20108:1
175 (anonymous) @ precore.js:11
176 k @ boot.js:2
177 fireWith @ boot.js:2
178 e.<computed> @ boot.js:2
179 (anonymous) @ boot.js:2
180 k @ boot.js:2
181 fireWith @ boot.js:2
182 e.<computed> @ boot.js:2
183 execCb @ boot.js:10
184 check @ boot.js:10
185 enable @ boot.js:10
186 init @ boot.js:10
187 (anonymous) @ boot.js:10
188 setTimeout (async)
189 require.nextTick @ boot.js:11
190 f @ boot.js:10
191 requirejs @ boot.js:10
192 window.require @ boot.js:16
193 (anonymous) @ precore.js:2
194 multiple @ precore.js:11
195 j @ precore.js:7
196 f @ precore.js:3
197 dispatch @ boot.js:2
198 q.handle @ boot.js:2