Probably due to FPSS I have noticed my main horizontal menu dissapeares from time to time???
my url is www.apartments-cala.com/ from time to time it dissappears (in any browser-have checked), after a while it comes back...

99.99% sure this isn't Joomla or the Template but something interfering that's causing the menu to drop out.
My 1st suspect is FPSS. In the Firebug Console, soon as mysite loads there are hundreds of error messages being generated, all like this:

Error in parsing value for 'z-index'. Declaration dropped.
Notice the FPSS php seems to be generating two different values for the z-index, 89 and 90 for the same tag. So I wonder if this is where the error is coming from? please see attached screenshot:

can you give me some suggestion on this?

most of my templates get in some conflict with FPSS but when I started turning off the jquery library handling it usually gets better??
I've logged in a dozen times. The 1st, the menu was missing and the last 11 it was there.

Did you solve it?
I can see FPSS and main manu in your site just fine...

Hi Katia,

as said it happens from time to time... and only the fpss shows errors in the firebug console while this happens...

I'm using Joomla 2.5.3 with FPSS 3.2.0 and I'm getting the same WARNING:

Error in parsing value for 'z-index'. Declaration dropped.

Now the slide works but these warnings will continue to count and could possibly hinder performance.  I found a possible explanation of this warning:

The actual code (not the posted code, which works without warning on Firefox) probably contains a no-break space (U+00A0) instead of a normal space in the declaration z-index: 9000;. (At least such a construct triggers the warning.) Change it to a normal space. The problem might alternatively be the presence of an invisible control character in the code.

I was hoping the author/authors of FPSS could take a look at this to stop the warnings.

update from my side:
sometimes even the frontpage didnt want to load, only the frontpage... all other subpages loaded at the same time seamlessly?

so the only difference is I have installed fps on the frontpage? is there a way to disable the jquery "possible conflict"?
I have turned it off in the FPS module settings and in K2... but I still get this error warning:

jQuery is not defined
var $K2 = jQuery.noConflict();

What's funny is if you Firebug the FPSS demo page, you get the same WARNINGS about the z-index declaration being dropped.  So the z-index WARNING doesn't seem to be site problem but a module problem.

@johnniek2,
you may change the jquery library handling option in FPSS module parameters.