We have recently bought a site License for Display fusion and have rolled it out to lots of users with great effect. Kudos on this application, one of my favourite 3rd party apps.

However I have now got two users with an odd bug/conflict, both are using dual screens on XP SP3 on a Dell desktop with an Intel(R) 4 Series Internal Chipset graphics adapter.

A strange Blue arrow on a gray button appears next to the Swap Monitors Titlebar Button on certain windows (not all) but only on the when that window is in focus and only if it is not fully maximised. If pressed the button makes the active window vanish but the task bar entry stays there, it can be difficult to make the application re-appear (one program I had to remove the registry entries for last window position)

I'm not sure if this is caused by Display fusion or if Ultramon or something may have once been installed. Both users state that it is only since Display Fusion was installed that the button has appeared. I have used the compatiblity settings in Display Fusion and removed the Titlebar Butons from a couple of programs but although the Display Fusion button vanishes the blue arrow remains. I can't see any other program that might be adding the button.

Any iDeas?

I may have just answered my own Question http://en.community.dell.com/support-forums/software-os/f/3526/t/19277935.aspx

This topic can be closed. The link ablove is the answer. To be precise the fix is to edit this registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Intel\Display\igfxcui\hkcmd value EnableMovingWindow = 0

I have seen a couple of other discussions on here that seem to be refering to these arrows, hopefully this will help these people too.