>What line of code cause the error?

can't really pin it down to a line of code. Only a method.

When it works properly, it completes the Load method of the form and then starts running through the inits of the various objects on the form.

When it crashes, it completes the Load, but doesn't move on to the inits. The last line of code, therefore, is the 'dodefault' (which will be the FFC base Form Class Load default) which is the last line of my Load. method.

Harry