Problem after ModSecurity Update

-- HikaShop version -- : 2.6.5
-- HikaMarket version -- : 1.4.1

My rochen server has updated ModSecurity yesterday and since then in my Hikamarket frontedition screen I cannot see anymore the Drop images box.

I know my HikaMarket is not up to date but before a default answer of "please update" could you make some suggestion or confirmation this problem could be related to this ModSecurity module update?

UPDATE:

Indeed the problem happened after I made a "FIX PERMISSIONS" with Admintools as I had some problem to save product changes. I was getting an Access forbidden message by the browser. Then I fixed permissions for the whole site and the Save Product problem got fixed but the Drop Images area stopped showing.

Shall I give any special permission to the 'upload' folder or other images folder?

Following your advice I get this warnings in the Safari Inspector-->Console

I use jquery easy 1.6.1

Updated HikaMarket and HikaSHop to current version.

Although newset jquery easy installed I was getting the googleapis error so I use a local copy of jquery and the error is out.

Now I get this error:

[Warning] Unexpected CSS token: : (gzip.php, line 225, x2)
[Warning] Invalid CSS property declaration at: ^ (gzip.php, line 610)

I deactivated the Gzip compression and the Warning messages persist.

I isntalled the site in local and the No drop image area problem persists also in local, but it lives together with a 5 some weeks old install where the drop areas work perfectly.

I made a total swap of files form the old to the new except for configuration.php and the problem persists in the new site (I mean all old files from a working site and the DB from the new faulty) and the problem persists.

Really exhausted, don't know where to look for anymore.

Please any hint in the HikaShop community?