(Had the trial wifi option) But now new music doesnt show album covers. The songs I had on my phone before the wifi trial was up still shows the album covers!
This way the TL; DR: see 2 possible solutions at the bottom As noted by Nithin Philipps, the problem lies with the fact that all these MP3 were in the same folder and shared the same and Album Art If you can't see these files, make sure that Explorer is set to show hidden files and folders, and to show protected operating system files.
I think the album art thumbnails are cached by wmp.
These files contain the album art that was automatically downloaded by WMP, so it might be a good idea to back them up first.
When I change MP3s, (Windows Media Player running this time), sometimes the cover stays stuck still on the cover of (A), sometimes it displays the good one.
If I quit at this time and restart Windows Media Player with the same MP3, the cover of (A) is back again...