i think that's caused by having some incompatible .log file in the database folder. i've always just redownloaded everything,
though i'm sure there's an easier way to do it
Not an incompatibility caused by a new bitcoin-qt version, the update is older than a day. Maybe from another software/library.
And by the way I forgot to tell that it seems to be downloading blocks/something (the folder size is growing
)).
Maybe I could delete only some files, in order to save some time ?