The library history playback option to prune the tracked history might be responsible for (or at least more likely to trigger) the database saving related issues that have been plaguing the last few builds.
Going to Preferences -> Media Library -> History & un-checking the "Limit tracking to items played in the last x" option might help to minimise the chance of experiencing a crash.
This is being investigated to try to get it resolved once & for all as I'm as annoyed about it as anyone who might be experiencing crashes. Alternatively another workaround is to add threads=1 in the [winamp] section of your winamp.ini
The location of that can be found by going to Preferences -> Advanced -> Diagnostics -> Settings Locations tab which will show the full path of your winamp.ini file. This change however can make the saving of any db changes much slower which might cause other issues.
More likely to be seen when using a modern skin, some setups might experience random deadlocks due to an interaction issue with how it tries to get metadata for the script(s) being run. The next build will make another attempt to workaround this problem which is primarily a design fault with the gen_ff plug-in only working in a single-threaded manner & blocking the main ui thread for metadata requests.
Some modern skins may not draw correctly with either partial or completely missing window frames. This seems to be due to a change made on Feb 20th in the interim / beta builds to resolve seeker bar elements along with some other elements not showing as expected in the skins. A solution to keep the prior fix & un-break the skins now being reported as broken is being looked into.