[SOLVED] Block disappearing

[Kicsihun]

Hello!
I'm working on a layered navigation block module. (layered navigation e.g.: you click on the 'I-pods' category , it displays the manufacturers of the products within the 'I-pods' category )
My problem is, that the layered navigation block from the left column disappears when I'm on certain pages.
Could someone tell me, what is the problem?
Thanks

[rocky]

The categories disappear whenever there is a Javascript error on a page. In IE, click on the "Done, with errors" icon in the bottom-left corner and post the error message here.

[Kicsihun]

The categories block doesn't disappear, none of the blocks are disappearing only the layered navigation block.
I'm testing the shop with Mozilla with the WebDeveloper add-on, which displays Javascript errors. In my case there aren't any Javascript errors.

I have also created a block which displays price ranges in the left column, but I don't have any problems with this one.

[rocky]

If you are getting incomplete pages, then there is probably a PHP error. Edit config/config.inc.php and temporarily change 'display_errors' from 'off' to 'on' so that you get an error message that should help you pinpoint the problem.

[Kicsihun]

Thanks a lot, this solved my problem: I had some undefined variables!

Thank you again!

[rocky]

If your issue is resolved, please edit your first post and add [sOLVED] to the front of the title.