When you installed build 242 did you install it to a different location than where build 241 was installed? Doing that can cause problems if the previous version was not completely uninstalled - including clearing out the EFILive registry settings.
If you go back to build 242 and the same problems exist, check that the appropriate *.calz file exists in the folder (for example LS1B):
\Program Files\EFILive\V7.5\Calibrations\LS1B
If the *.calz file does not exist, you may need to re-install the software, and/or verify that the folder setup (in the EFILive V7.5 Scan Tool) is pointing to the correct calibrations folder:
(Usually it points to \Program Files\EFILive\V7.5\Calibrations, in the screen shot below, I have the software installed to "D:\EFILive Production", so the *.calz files are located in that folder).
Regards
Paul