I'm using -current and XFCE 4.6.2 hasn't been playing very nice. Its menu has an odd behavior. AFAIK, XFCE's menu is automatically generated based on the .desktop files from /usr/share/applications and somewhere else when it comes to wine programs. The menu has an "Other" tab, which includes Gvim and, ever since I installed it, Civilization IV BTS.
The problem is that sometimes this "other" menu just disappears after staying logged in for some time, like overnight. I was thinking that this had something to do with suspending to ram, but I don't think that's the case as I've been suspending over and over and the "other" menu just stays there.
I don't know if someone else has noticed similar behavior so I'm not waiting for an answer as to what may be causing the issue. I'd like to know where I can start looking for the cause.
XFCE masters, where can I start looking?

Are you suspending with xfce's inbuilt power manager? It kind of duplicates acpi but in your case it's probably the answer. Retire acpi events as xfce's power manager takes them over or you'll suspend twice every time you tell it to suspend once.