I got 16 extensions installed and 14 of them make use of the space next to the omnibar; however I can only see 9 of them at any one time

One extension decided to check whether there are updated plugins and AdBlock+ disappeared and ads start appearing

I have currently got 15 Browseraction icons visible...

Restart chrome and adblock+ will be again at 1 position. For your other problem I can't help you. Well I can: the solution is simple: uninstall

now that's interesting;

I revert to the original theme and still only 9 icons are visible including adblock+

Luc VN, sulasno
what screen resolution do you use?

1024 x 768

My screen resolution is 1600 x 1200
.

@Luc VN
when you resize your window, your buttons will start disappearing

ps: why don't you use One Number which checks gmail, wave, voice and reader within only 1 browser action icon instead of your 3

Ok, I have played and resized with the help of the Resolution Test extension
and my buttons start disappearing at 1024 x 768.
So even at 1280 x 800 everything is still there
With my native resolution of 1600 x 1200 I have some more freedom to add some extensions.

With my 3 installed I do not have to click (open) just to see if anything has changed...

You don't have to click. A unread number count is shown as a badge with a different color for the different service, also the icon changes to what's new. Give it a try