Pretty sure I used the linked utube video first time I had to do this. Then my kid showed me the slightly quicker way. Work with win8 long enough,, and you will be a pro at this! Everything I do it seems has an unsigned driver.

Guys... I am using UC100 with Gecko G540 with success. Initially i was getting trouble at each startup i was having no-connection issues. I resolved in following manner:
1- Scan my computer with Avista antivirus (free edition). Lot of viruses rectified with boot scan.
2- I always start computer first and then i connect the CNC control panel. This way i never got problem with UC100
By the way the controller is great:)

Sometimes if you get a buffer error, then it helps to shut of the internet connection. Also, its best to set your screen and sleep timers to never goto sleep, and never shut down the screen. Its quite un nerving to be busy working while the machine cuts, then your monitor goes black, and the machine is still making chips! Let it go much longer and the comp goes to sleep, the uc100 loses connection, machine stops and then its time to start over.  Best to make your computer never goto sleep.

Thread revival! I have been trying on and off for a YEAR to get this to work. I'm having the *exact* same issue as the OP (after installing UC100 drivers/plugin, upon opening Mach3 I'm getting "Plug in DLL defective. Reload".  I click ok and the next screen says "UC100V2_148.dll, defective plugin found, ignoring"). I've done so with the methods described in the thread for installing "unsigned drivers" and still no luck.
I've noticed that the manual for the UC100 now says "Our drivers are now WHQL certified by Microsoft" and Win8 is listed as officially supported. But still... Mach3 driver load errors!
Anyone know what else I can try? Could this be something wrong with Mach3 installation? If I delete the UC100 plugin, Mach loads fine w/o errors.
I'm running Win8 on the Toshiba Encore Mini 7" and my licensed copy of Mach3 Pro 2.0.

-Colin

Colin are you still trying to load drivers from the Mach3 site or did you go to teh UCCNC website and download them from there . I believe you are ONLY going to get teh new updated drivers from teh UCCNC website.

(;-) TP

BR549- I get them direct from http://cncdrive.com/UC100.html
According to the error screen, it looks like I have 2.148 installed, which is newer than the text on their site stating V2.146, and the manual mentions V2.145!

Double check t make SURE there are no left over DLL,s from a previous attemp to install .  THAT will cause problems.

(;-) TP

You're using Mach3 version 2.0? Try version 3.043.062

Guys thanks for the input! I had also reached out directly to support at CNCDrive who sent a pretty lengthy response. One thing they mentioned to try was make sure DOTNET 3.5 was installed (includes 2.0), so altho my tablet showed it as installed, I told it to uninstall and then re-install 3.5 and now it's working w/o errors!! Hope this helps anyone else coming across this thread.
The next thing I was going to try was purge all previous versions, but so far it looks like I didn't need to do that.

Ger21- I'll look into updating Mach tonight as well.

Too bad that support for XP is just about over.

Chas.

I dedicate my PC to running Mach and nothing else, so it never even gets connected to the internet. The updates and "support" have no meaning to me because I never need or use them. I just install XP on a formatted hard drive, do the optimisation, etc and away I go. If you can find a PC to run XP you could use XP for ever for just Mach.

Keith.