Hi

I changed my main OS from Kubuntu 12.04 64bit to Linux Mint 16 KDE 64bit a couple of weeks ago.
It seemed work well but I noticed the window menu of Firefox doesn't work.
When I click it, it flashes momentary, but no drop down menu appears.
It's the same with short cut keys. e.g. Alt+F, Alt+E, etc.
So I restarted Firefox, and its window menu functions came back.
But after a long while, again the window menu became not to work.

First I thought it's a matter of Firefox.
So I removed and reinstalled Firefox, turned off and on add-ons one by one, and almost determined multi-tab add-ons were the causes.
But then, I noticed the window menu of Thunderbird became not to work either!
So I determined the problem is caused by KDE.

I suspect this problem is caused by gtk2-engines.
Because I don't use default gtk2-engines-oxygen, as it doesn't work well with Eclipse.
I use gtk2-engines-nodoka instead.

I have already struggled with this problem for a week and searched into Google, but cannot find any solutions yet.
So I have decided to seek help.

Is there anybody who has the same experience or knows a solution?

Thanks in advance.

try using qtcurve instead

Thank you for your quick reply.

google01103 wrote:try using qtcurve instead

I've already tried.
But qtcurve also crashes Eclipse which I really need, so I can't use this.

if you disable compositing (alt+shift+f12) does it help ?

maybe try using a different gtk2 theme for specific applications
https://wiki.archlinux.org/index.php/Un ... ific_theme

google01103 wrote:if you disable compositing (alt+shift+f12) does it help ?

I will try. But it takes time to confirm.
The phenomenon is reproduced several minutes or a couple of hours after restarting Firefox.
I guess it depends on number of operations or some specific operation causes this problem.

google01103 wrote:maybe try using a different gtk2 theme for specific applications
https://wiki.archlinux.org/index.php/Un ... ific_theme

I will try it too. I didn't know such a thing is possible. So it's very useful.
Thank you for your advices.

But anyway need time.

nb. that firefox and thunderbird are (likely) the only two XUL applications on your desktop - you can expect them to share random issues.
If it's limited to them, the error will likely be there.

Or is it related to compositing? Toggle on/off with Shift+Alt+F12.
If it is, try disabling HW acceleration in FF/TB ("about:config", filter for "accel")

The problem is solved.
The phenomenon was caused by GTK2 theme Nodoka as I suspected.

Before testing your suggestions, I wanted to know if the problem was really caused by Nodoka.
I set the GTK2 theme back to oxygen-gkt.
Then I had operated for a few hours, but nothing special had happened.
And I also recalled I had not noticed the problem a first few days after I had installed Linux Mint 16 KDE.
So I was almost convinced that phenomenon was caused by Nodoka.
But I should have continued testing without changing circumstance, since I was not 100% sure.

So I decided to try the newest version of Eclipse.
If it works well with oxygen-gtk, all my problems will be over.
I downloaded Eclipse 4.3 Kepler from download site, installed and tested.
It didn't seem oxygen-gtk crashed Kepler.

I have tested for another few hours, and now my trouble is over.
The problem of window menu was caused by Nodoka.
Eclipse 4.3 Kepler isn't crashed by oxygen-gkt which does crash Eclipse 3.8 Indigo.

Thank you everybody.