Account Limits

I finally decided to upgrade my Cyberfox/XN from v51.0.3/3.5.25 to the current Cyberfox/XN 52.7.2/4.2.1 since I have been having problems checking my Hotmail/Yahoo/LinkedIn accounts.  I have 15-Gmail/10-Hotmail/7-Yahoo and the current XN does not check all my account.  I can do without my Hotmail and Yahoo checking, but XN only checks about 1/2 of my Gmail accounts.  I have rolled back to XN-3.5.25 and my Gamil accounts are all checked.  Is there a limit and the amount of accounts XN can check.