Update 2 Not only is the MCP2210DLL-UM.dll from MCP2210DLL_2014-10-29.zip linked against msvcp90.dll and msvcr90.dll , but it is a requirement to have the program locading MCP2210DLL-UM.dll to be linked against these two, doing otherwise causes an error which says "R6034" An application has made an=20 attempt to load the C runtime library incorrectly. Please contact the application's support them for more information." . Well, I consider to=20 have contacted it hencewidth. Indirectly. Will take a while before I touch this again. I am wandering off to do real work. Pity about the broken toys. I wonder why I may be the 1st one to see this error? There is no mention of it online until now. None I can find, at least. I also make an educated guess about MCP2200*.dll having the same proble, since it is of the same vintage. Will check this later. Groan. I thought only Microsoft is big enou= gh to afford outsourcing qc to paying beta testers >;). --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .