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I am still unable to duplicate this problem using latest codes from CVS.
I created 30 bogus users (someone mentioned they had problems with 16). Put them all into 'Registered Users', and randomly assigned a bunch to a few other groups. I can successfully mail one group, all groups, a few groups, etc... no problems.
Please make sure to get the latest files in modules/system/admin/mailusers/ from CVS on sourceforge.
If that doesn't work for you, can everyone give me more details of problems? Everything you can think of. XOOPS version. Was it an upgrade? How many total users? How many users in the groups you are mailing? Are you selecting other options on the mail-to-users page? Debugging messages? Does your 'edit user' page work correctly? etc. etc. Does it mail to *some* users but not all?