[Error Message] [answer?] Try to change selected users group, but 'sorry' ?

[akm]

.
Selected (check marks at each user) all users at http://xxxx.xxx/admin/index.php?module=u...ion=search
But when try to change 'users user group' get...
"Sorry, but you did not select any users. Please select some users and try again."
1st time this has happened.
Re-tried several times but same 'error' message.
Ideas ?

[update] Maybe do with SQL at database ?

[.m.]

check if java script is blocked in your browser on admin panel pages
have you recently added any jQuery based plugin / code modification ?
also run file verification tool available at tools & maintenance section & focus on changed & missing java script files

[akm]

.
Thank you for the questions.
1. I think java script is enabled (Firefox list scrnshot attached)
2. Havent made any code changes for some time.
3. 'file verification' jpg/s list attached

[update] Just checked and another similar forum, different domain name, is marking users and changind user group just fine... so, at least, must not be 'java' ?

[answer?] Looked at other similar forum and view set at (default?) 20.
Had set subject forum view at 1000.
Changed to 500 and now, select and change user group, works.
Is there a maximum number, under 1000 and over 500, that would work... ie is there an official max, or would we need to do a lengthy T&E ?
Maybe I need to post this question in 'general support' forum ?

check if java script is blocked in your browser on admin panel pages
have you recently added any jQuery based plugin / code modification ?
also run file verification tool available at tools & maintenance section & focus on changed & missing java script files