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Hi,

unless a solution is given, can we keep this issue Active ?

Using Bootstrap 3.1devb2, I experience the same problem on 2 sites. No error though, and the solution is to empty cache and sometimes rebuild the registry.

This is not server dependant, on 3 different LAMP configuratiosn it occurs.

Moreover, it doesn't affect main menu only, every preprocessing functions are not recognized when the problem occurs (for instance tabs are given as a raw html list when the problem fires).

I was suspecting some MySQL overflow or something like that (on cache tables insert for instance), but I can't find any clue in logs.

Thanks in advance for any tips on what can bring this behavior.

Well, as far as I can tell right now, the problem occurs when Mail System module is activated, and if so, clearing the cache leads to a state where bootstrap functions are not known by the registry. Then the way to have a correct state is a drush cc theme-registry call

I'll investigate why.

[Edit] : there's a conflict with mailsystem_theme_registry_alter function found in mailsystem.module file.
I don't know if this issue is a Bootstrap or a Mail System issue.

Thanks Mark!