Make explicit whether LINQPad is running as 64- or 32-bit.
I get the dreaded 'An attempt was made to load a program with an incorrect format... ' error, which usually means that I'm trying to load an assembly compiled for 64-bit in a 32-bit environment. However, there's no explicit way to see this in LINQPad. It could be shown in the 'About' window.
This features is available from 6.9.x