I have encountered a similar problem when I swittched from MC17 to MC18 yesterday. I have already more than 20 000 songs recorded on a NAS (mainly in WAV). The MC15-MC16-MC17 libraries installed many years ago worked perfectly on WIN7.
First, MC18 was insalled on my main computer as an upgrade. The library probably used a copy of the previous MC17 library, with no noticeable problems. The main problem arose when I installed MC18 on a second computer (laptop with win
, when MC18 rebuilt the database from the NAS: About 1/3 of all songs came with tags in chinese characters!!! (excepting the file locations which are correct)
Then, I reinstalled a version of MC17 on the laptop, re-run the rebuilding of the database, and everything came OK: the tags appear in latin characters correctly with the exception of some new songs previously registered by MC18 appearing in chinese characters, even in the MC17 library. Therefore, I will uninstall MC18 waiting for a correction. My hope is that the database will not be corrupted.