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-happend after change from build 060906 to 060907 when I opened a vmd document -I'm unable to reproduce -maybe the exception stacktrace wil help...
Created attachment 33667 [details] stacktrace
Unfortunately I cannot resolve the root of the issue from the stack trace. I looks like a race-condition while opening document. Document of loading in a background thread and the document instance exists but is not registered in the Designer class (as the document or loadingDocument) yet. I cannot fix this issue because I cannot prove that the change will help.
it seems that you have an idea where is the race condition, don't you? Anyway, imo, it's not worth to fix it in 5.5
Anyway I do not want to fix it in 5.5 - if not for something else, then at least because i cannot prove whether the change will be fix it.
Designer 1 has been removed from NB 6.0 therefore resolving issue as WONTFIX. Designer 2 does not have this issue.