MM,

I know that my previously suggested corrective actions involved a bit of work on you part. Here is my reasoning for my previous suggestions. They were listed from least work to most work involved.

1- Re-save or re-create app_config file - I have had one experienced where an app_config.xml file got corrupted transferring it from one rig to another. After many frustating problem solving hours re-creating it corrected the situation.

2- Switch from BOINC 7.0.59 to 7.0.58 . BOINC 7.0.59 is an unknown entity for me I am successfully using 7.0.58 and I know that it works.

3- Re-install CAT 13.1 after full uninstall and Nvidia and ATI display driver sweep with Drive Fusion and/or Drive Sweeper. As stated by Nano, switching a rig from Nvidia to ATI/AMD video drivers or vice versa can leave many entries in your file folders and OS registry that will cause you problem(s) after the new install. This is specially true when dealing with older video drivers and OEM un-installing applications.

In summary MM, by switching from an Nvidia to AMD video card & driver you have made a major switch to that crunching rig that could have left troublesome remnants of the previous Nvidia video driver behind. This may require you to do a full set of video driver sweep (Nvidia + ATI/AMD) to rectify the situation.

For your consideration,
Jean-Guy