CSS Compression problem

Hi,
I had CSS override ON with a lot of CSS overriding.
I had CSS compression OFF.
I turned it ON.
No problem : took my css overriding.

The problem is now :

I can not make anymore overriding.
The CSS are blocked at the moment on which I turned ON the CSS Compression.
All the new css overriding are not taken into account.
If I want it I need to turn OFF the CSS Compression.
Then the news css in override work.
If I turn back CSS Compression ON, I go back to the "old css overriding stage".

Any ideas ?

Hi,
Did you clear cache after you add new rules to override.css ? Please try do this should help.

You mean the cache in Site / Maintenance / Clear Cache ?

This one and Site / Maintenance / Purge Expired Cache.

Done and worked
CSS Compression backed ON and on the good version.
Thanks for your quick answer.