"Failed to load workflow" Error - ARRRGGHH

After much searching on the internet, and failed attempts to delete the requisite c:\Documents and Settings\\Application Data\Microsoft\yada yada yada....

I found the solution to resolve the "failed to load workflow" error...

http://jonathanpmast.spaces.live.com/Blog/cns!50782F8FDA1E73DA!253.entry

"The solution, which I realized way too late, had to do with trust level found in the .NET 2.0 Configuration (the MMC snap-in, found in Administrative Tools). We go .NET Framework 2.0 Configuration > Runtime Security Policy. Choose "Adjust Zone Security". Went to Intranet, pushed the slider up to full trust. Restarted SPD, worked."