I have encountered some bugs in MetaTrader 5 Platform for both Windows 8 and Android versions that cause OS instability and MT5 application crash.
Unfortunately I haven't found a bug report section where I could describe the issue.
on the forum (mql5 bug is mql5 programming bug? because mql5 is programming language ...).but please note that any bug should be replicated. It means: you found the bug so everybody (and the seruice desk) can repeat it on their computers and confirm it.otherwise it is not a bug.
you can check how they are doing it on this rus thread concerning mql5 programming discussion by beta testing of the latest beta build of Metatrader 5 - MQ are fixing everything directly "on the thread" (on the same way as I described above: if the admins or the forum users can replicate/repeat "this bug" so it is the bug; it not so it is not a bug).