Sorry I have no idea...
With AVSMeter 2.6.1 I get an error message complaining that the AVSInfo.log file could not be read. No further explanation what exactly caused the error. Using AVSMeter 2.1.3 users never get to see this log file, so there is no way to compare the two versions.
Whatever, it is not worth the trouble to fix this. For AVStoDVD the old version 2.1.3 works nicely, and since the software is small and portable users can easily keep a current version of AVSMeter in a different HDD folder.
Cheers
manolito