can your provide more info as to what you are doing?  these things are done from different locations, so not sure what you are doing…

groups and forums are deleted from with the admin at forum – forums – manage groups and forums…

deleting topics is normally done from the front end forum using the forum tools (see:  http://codex.simple-press.com/codex/faq/problem-with-post-edit-buttonow-to/problem-with-post-edit-buttonow-to-delete-a-topic-or-post-and-other-tools/)

from admin at forum -forum -manage groups and forum i cannot delete any forums or groups.

I click delete this forum, for example, but nothing happen. The image is moving but doesn’t finish.

Idem if i use the tools on the front and, in a topic or for a thread. The same think, i am unable to delete nothing

That sounds as if something is stopping the AJAX calls from working. Do you know how to use the script console in the browser? If so can you open it and then try one of these operations again to see if any errors get reported?

I use, in firfox, web console. Right?

i empty console and try to delete a gruup in admin page. Nothing happen, but console displays three line:

[15:11:09.974] GET http://www.tempovissuto.it/wp-content/plugins/simple-press/admin/resources/images/sp_WaitBox.gif [HTTP/1.1 200 OK 188ms]

[15:11:09.976] GET http://www.tempovissuto.it/index.php?sp_ahah=forums-loader&sfnonce=01947148e5&loadform=deletegroup&id=3&rnd=1380805869854 [HTTP/1.1 999 AW Special Error 125ms]

[15:11:10.059] nessun elemento trovato @ http://www.tempovissuto.it/index.php?sp_ahah=forums-loader&sfnonce=01947148e5&loadform=deletegroup&id=3&rnd=1380805869854:1

This help you?

yes, those are the ajax requests… you hsould be able to expend them and see more information as to what is reported…

this:

[HTTP/1.1 999 AW Special Error 125ms]

is interesting…  seems to be a rather unique IIS error message… is this an IIS server?  you can google it for more info, but might be time to contact your host to see if they can help with that

more info:

URL richiesta:     http://www.tempovissuto.it/index.php?sp_ahah=forums-loader&sfnonce=01947148e5&loadform=deleteforum&id=4&rnd=1380807260333

Metodo di richiesta:     GET

Codice di stato:     HTTP/1.1 999 AW Special Error

X-Requested-With:    XMLHttpRequest

User-Agent:    Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20100101 Firefox/24.0

Referer:    http://www.tempovissuto.it/wp-admin/admin.php?page=simple-press/admin/panel-forums/spa-forums.php

Host:    www.tempovissuto.it

Connection:    keep-alive

Accept-Language:    it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3

Accept-Encoding:    gzip, deflate

Accept:    text/problem-with-post-edit-buttontml, */*; q=0.01

Header della risposta Δ156ms

Server:    Microsoft-IIS/6.0

Date:    Thu, 03 Oct 2013 13:34:07 GMT

???

still the same 199 special error…  would contact the host for more info… would still like confirmation that this is IIS (v6?)…

and that looks like the headers for the request…d id you see the response or html?

i see the response.

I’ll contact my host, but now i don’t know if is IIS… where i found this information?

the headers seem to indicate it plus googling that error indicates its odd IIS error…  your host would confirm…

If confrim…how i repare?

unknown…  need to better understand that very odd server error and what it means…