When this bug happens:
I start Minecraft then go onto "Multiplayer".
I click on any server (does not matter whether it has been detected as accessible or not accessible) and click join.
On the loading screen (searching for server... / joining server...) or after Minecraft fails to join a server I click cancel.
I am now back on the menu screen as normal and I click the "Multiplayer" button again.
Minecraft instantly freezes and becomes totally unresponsive. Basically it crashes. However it does not close on its own or even say "not responding" - it just sits there frozen.
When I go to close it with Task Manager, Windows tells me that "Java Platform (SE) Binary has stopped working".
I know of other people on the forums having this bug as early as 1.3.1 and having it all the way up to the present (as have I).
On top of this problem, for myself and several others this bug always causes the "When Minecraft Closes, Javaw.exe stays running" bug. I do not know if the two bugs have some sort of link but because the javaw bug already has a ticket (https://mojang.atlassian.net/browse/MC-1408#comment-20993) I will not go into detail.
Post Script - What happens when trying to get crash report:
I tried all three methods to get a crash report stated on the Minecraft Wiki.
When I start the batch file, Minecraft starts normally as it should do. I replicate the crash (Multiplayer -> any server -> cancel -> multiplayer) but the log file does not say anything past "connecting to server whateveritwas". I close Minecraft with Task Manager, which suddenly tells me that I am using 98% of my memory and the culprit is the process "java.exe" that has just started leaking memory massively and like the javaw.exe bug metioned above, nothing can close it. To top the problem off, I still have no more data in my crash report because the batch file trying to record my internal commands has been overloaded by whatever is crashing Minecraft and CMD and the whole of System 32 have been taken down by it! (Last step, force shutdown using tower button and sigh heavily...)