I've been getting this error lately for the past few days when clicking one of the existing library tabs on a different computer.
MusicBee v3.2.6902.32258 (Win10.0), 20 Sep 2019 11:13:
System.IO.IOException: The device is not ready. [D:\Duarte\Media\Music\DPFRMusicBee\Playlists\Genres\Nineties Dance Music.xautopf]
at #=zf67MEopCrwJkUkPlGumBqLA=.#=zworXhnS61bwz.#=zFHD6TAw=.#=zCvOFqo_tKLit(#=zpIyIGMKAjgJgqIRF6g== #=zRFcHc7Q=, FileShare #=z$bHBZkU=, FileOptions #=zyPL7H3U=, Boolean #=zmFaAsvwdppoG)
at #=zs2BceXvhc5ayfbP7iCv2QXneZdid.#=zoxcMoMU=()
at #=zGQ2Dv0Sa2dr8x55F8dLAfPzu1vYq.#=z0hlXk2iqJer7Q7KAnw==.#=zbpwB8dw=(Boolean #=zpFr7GbQ=)
at #=zGQ2Dv0Sa2dr8x55F8dLAfPzu1vYq.#=zdfx11pnBHPhW(#=zMQAYZvfSNKUaTAsexe9ucMw= #=zgdAeYGwrhyav, Boolean #=zpBpy56gaIm2Y, #=z3bMrhAg= #=zpOjqqcU=, #=z0tKmjN7s8$nDGDk7Mq2EKqc= #=z999k05p0b1zh, Boolean #=zVY_Ts8wE_I2m, #=z37D7WKmLvIHbkP9e5abMHoM= #=zjpBs1eSr_C6y, #=zehcg8y8_ziYqQJa27keIrUU=[] #=ze0y8SLOgLmI_, Boolean #=zYolYhVVCutZ3)
I use MusicBee portably and open it daily, when switching computers from home to work I always get empty tabs, and I have to manually click them and browse to the correct playlist to repopulate them (https://getmusicbee.com/forum/index.php?topic=28090). This error happens when I click one of the existing autoplaylist tabs.
Just for the sake of documentation I tried with the latest version v3.3.7165.34284 nd I get the same error
MusicBee v3.3.7165.34284 (Win10.0), 20 Sep 2019 11:40:
System.IO.IOException: The device is not ready. [D:\Duarte\Media\Music\DPFRMusicBee\Playlists\Genres\Nineties Dance Music.xautopf]
at #=zCMaSRNnJCqtBTKKZmRgg94M=.#=zcjrA8XJx9ulW.#=zkFwPzTk=.#=zptbMLaGUtc2$(#=z3Kz1DsoR9bFcHnOPRw== #=zvyJWKp0=, FileShare #=zSKEek4c=, FileOptions #=zHHzVO5w=, Boolean #=zu2drgjKmSKLp)
at #=zXPOcbQwcoCe18I0qGCvk8ZHbnyjk.#=z$79UgIc=()
at #=zxSs8$Zj1YyE$QLYKTW9wh8Od34QB.#=zThFoBYoLSO_VvDBTBA==.#=zebwvFsM=(Boolean #=zDx2Mxp0=)
at #=zxSs8$Zj1YyE$QLYKTW9wh8Od34QB.#=zkh$3YnnZKCF0(#=zfcT6tG2gZ9QydKEZ48ftAuI= #=zEH_hLiGcbNOH, Boolean #=ztqkXonDwgWfA, #=zkuDn43Q= #=zsZOUqYs=, #=zGCa2G8o60ctHh3eDYu_2AWs= #=zM4IQFXtPunJS, Boolean #=ztgHTydpxNIIL, #=zpwYqZMoLK6eVkTssbgy60Ps= #=zmpEIs_HCrunj, #=zxHTiYwJAU2m2nRLCq2wl9Zg=[] #=zR77RdKExxuzF, Boolean #=znK736gt$qlZF)