Problem adding indicators to charts??

All of a sudden any new indicators that I download to my mt4 platform will not attach to a chart.

The ones I've had awhile, I have no problem adding to or removing from a chart.

Anyone have a clue as to why this is happening?
I have recently switched my firewall to Zone Alarm. Could this be the problem?

Thanks in advance!

did you try recompiling them?

Thanks for the response.

Not sure if I did it correctly but I just compiled them and they still won't attach.

so you see them on the left side panel in custom indicators,but they just wont attach?

Yes, They're there.

I've tried double clicking, right clicking, dragging them and nothing works.

how bizzarre! I doubt it would have to do with your firewall.

Why dont you try installing a new instance of metatrader
from another broker and see what happens? If it works,
you can copy over your templates , indicators and experts.

O.K. I'll give it a shot.

Thanks for your help.

Well I contacted support for my platform and they had no clue.

Uninstalled and reinstalled my platform.

The first indicator I downloaded works with no problem.

After that one, none will attach.