Right click/context menu appears invisible, minus the outline

Starting today and possibly yesterday, I have noticed some odd behaviour with my right click menu and the context menu.

I am running windows 7 home edition, 64 bit.

Whenever I first start up my pc and open a context menu in firefox, i.e select a sub folder in my bookmarks that open. The context box that appears is invisible, minus the outline of the box. I can scroll the mouse up and down and select links that are there, but the box never appears.

I then deselect it and reselect it, and sometimes it will appear, other times it takes multiple attempts for the context menu to appear.

See attached screenshot of the issue.

Other times I have noticed once or twice when right clicking on the desktop, only the left half of the context menu will appear, the other half is missing, but this does appear when I mouse over it.

Any ideas on how to fix this? I ran a "SFC /scannow" check in command prompt, and it came back clean and dandy, so I'm fresh out of ideas already!

Just happened again here, clicked the latest headlines drop down, and the box was invisible minus the outline, and the links could be selected in the invisible menu.

Like I say, it happens when I first turn on then occurs less often as the day goes on using the pc. I then recently restarted and within restarting, it has occurred twice in the first fifteen minutes.

koolkat77 said:

Hello and welcome to Sevenforums Elwood42

Disable hardware acceleration on Firefox and see if that makes a difference:

• Firefox GPU Hardware Acceleration - Turn On or Off

Just tried that and immediately after turning it off, it happened again on the drop down. I do find it odd as it's worked fine before with hardware acceleration turned on, but I'll see if it works after a restart.

Do you have any other suggestions in the event this isn't going to fix it, which I am unsure of?

Edit: Nope, just happened again after restarting firefox and my pc with hardware acceleration turned off. Next suggestion? :)

Also, just used the normal windows right click function, and this occurred, which I did mention in my original post. Notice how half of the context box is missing.

Restarted my pc, all seemed okay, then it happened again. I seem to be noticing a pattern in it occurs when I watch a youtube video, which uses adobe flash player. Not sure how it relates however.

I did have an adobe flash player update this morning, but I believe this issue was occurring before that. I just uninstalled adobe flash plugin to see if it would improve, restarted my pc, only to find the issue is still happening.

Beyond that, no I've not made any changes.