I had an issue with one of my last upgrade Hmailserver (5.0 to 5.1) : user's created IMAP folders are not visible anymore under squirrelmail (or not all of them).
The following screenshots of squirrelmail shows that only 2 folders are visible !

They are well ok under thunderbird and on Hmailserver console:


Everything was ok before my upgrade to 5.1.
I've tried with last version of squirrelmail, without success.
I also upgraded to last Hmailserver 5.1.2.346. No effect.
Is there a desync between Hmailserver and Imapfolder ?
Any idea of this very anoying issue ?
Thank you