Samsung C6750 no longer sees any MPEG2 video files after 2.6.4 upgrade

[BeFi]

Remark regd heading: This is a post related to Samsung D6750

After the upgrade of Mezzmo to 2.6.4 my Samsung D-series LED TV does not see any video files in my video repository any more. Instead got an error message that no video files could be found. My database has 400+ video files, all MP2 format.
My other Samsung C-series and my Philips 7000 both continue to see and play the same MP2 streams after the upgrade.

Measures taken:
I deleted the Samsung D device. Mezzmo re-recognized it as Samsung C ('C' for the first time, formerly always 'D')! Video files not visible.
I then changed the profile to Samsung D manually. Video files still not visible.
I then restored my OS image with Mezzmo 2.6.3 -> all TVs see the video files.

I cannot reproduce or produce any log files as I am now back on 2.6.3.

Allow a comment: Something happened to Mezzmo since 2.5.. The Mezzmo updates were a no-risk thing ever since I embarked on Mezzmo and since 2.6 they are causing more harm than they resolve.

Best
Bernhard