"Just a quick update on my displaylink (1.1.2 beta/10.5.7) driver problems.
I've had some luck getting it to work again. (he's using a mini monitor adapter, which needed the 1.1.2beta drivers for support.-Mike)
Keeping the installed 1.1.2beta drivers, I overwrote the actual DisplayLinkDriver file using the older version from the 1.1 release.
Using Pacifist to open the installers (you could use terminal) I replaced the installed 1.1.2beta driver found at:
/System/Library/Extensions/DisplayLinkDriver.kext/Contents/MacOS/DisplayLinkDriver
with the equivalent file from the 1.1 installer. The 1.1.2beta file was 71.1k, while the 1.1.1 was 71k.
So far so good, and better than waiting for an updated driver :)
(But I thought (per their driver download page) that only the 1.1.2 beta had mini monitor support (which you own - Nanovision UM710, 7" USB display link powered mini monitor).-Mike)
Basically I installed (again) the beta (1.1.2beta) drivers. Screen didn't work. But I took the raw driver file out of the 1.1 drivers, replaced the beta equivalent and it worked.
I can only assume it was failing with the 1.1 drivers not because the screens chipset wasn't supported but because it couldn't find appropriate device descriptions to fire the thing up with. Hence leaving all the beta support files behind added support for the mini monitors.
I guess in the beta drivers they added some more code which somehow got broken by the 10.5.7, and that the mini monitor support was not part of the core driver module, but added in via the other files involved in the install.
Confused but happy its all working again,
-Mike R."