Hiya,
I just upgraded from MEP 2014 to MEP 2015 plus (64bit). I opened a project in the new version and quality and smoothness of the preview playback is much worse in the 2015 compared to the 2014 version. Playback is choppy when trying to blend/transition or access multiple files or load anything with increased framerates. All runs perfectly smoothly on MEP 2014. I checked the program settings are the same.
The only difference is that I have MEP 2014 installed on a Solid State Drive, and MEP 2015 on a standard hard drive (all the video files come off the same HDD). Testing this and will report back.
Jamie.
EDIT: Running win7 64bit, AMD Phenom(tm) II X4 840 Processir 3.20 GHz, 16GB. nvidia geforce gtx 550 ti graphics.
EDIT 2: Installed on the SSD. This made no difference to the quality.
Any ideas?