Ubuntu 12.04 Unity glitches

[Michael Eacott]

I like Ubuntu 12.04 Unity but it continues to have problems in 
applications sometimes hanging or misbehaving when they are doing things 
that are not simple.
This has happened too often with FireFox and occasionally with 
LibreOffice writer. The latter had a problem today when its windows to 
cut/paste/save popped up blank.
I'd like to know how to report such bugs but don't know what logs may 
have recorded the problems.

Please advise.

Mike