Access Violation on module toad.exe but only from command line

Hi together,
sorry if I post this here but this is driving me mad.

I am running an automatic code review based on state of the art tools like Jenkins and sonar, and by using the sonar PL SQL plugin which in the end will call toad.
This all worked fine till yesterday, when I noticed the process was not running anymore.

After several hours, I found that everything is boiling down to jenkins calling a command like this:
toad.exe -CX F:\path\to\ini\cxfile.ini

The ini file is there and looks also fine. Tryed to connect with sqlplus and the credentials from the INI and it works fine. So connection should not be the problem.

Now if I run the above command manually, it is not working.
Toad will start and I can see in the taskbar 
- Connecting to Server 1 of 1
- Preparing for Scan
- Crash, error message appears: Access violation at adress 00FFF0AB in module toad.exe. read of address 00000008.

I have also enabled debugging with debug=1 in toad.ini. log is generated but no errors in there, the last lines contains something like:
-> TTeamCoding.executequery ('select table_name, table_owner FROM ALL_SYNONYMS WHERE owner='PUBLIC' and synonym_name ='!SYN_TC!')
<- TTeamCoding.executequery 
Application.Run

Nothing else.

So far I have tried the following with no luck:
- Changing Toad options for startup
- Removing .lay files from User files, as suggested on the net
- Change to a new different Oracle client (tried with 10.2 and 10.2)
- Change to a different Database
- Tryed to change ini file in the command above, removing all the unecessary
- tested with the same ini, on a complete different machine. Different os (Vista vs Server 2003), different client (11.2) and different database (11.2).

In all cases I am still seeing always the same error.
On the second machine I have MCafee AV, but on the first none (is a protected Server), so that cannot be the problem.

What is strage is that till some days ago it was working fine, and apparently there have been no changes on the server. Eventually some Patch updates?

Any Idea how to solve this??

thanks a lot and have a nice weekend
manuel



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