Since upgrade of OXAppsuite to version 7.10.4-Rev7 some userdefined Mailaccounts are missing

Hi there,
since I upgraded to 7.10.4-Rev7 of OXAppsuite some userdefined mailaccounts are missing, if I try to add them again, I get the info that they are already existing, but they are not shown in Appsuite.
An other problem is that in the shown accounts there are only mails of the last few days shown.
I would be pleased, if somebody can help me to solve this problem.