[sylpheed:35237] Right mouse button not working sometimes

[sopra-it at gmx.net]

Hi

I am using Sylpheed 3.1.4 on Ubuntu 11.10 64Bit and XFCE.

The problem is that sometimes the right mouse button does not work on the
message list: 
- Sometimes the drop-down menu does not appear when doing a right click on a
message.
- Sometimes even a wrong menu appears (for example "address book, templates,
actions,...")

Unfortunately, I cannot really reproduce the behaviour, it just happens from
time to time. But maybe someone else has observed something similar?