App Catalog error (Update WebOS)

Hi, I have been looking in the forum a similar problem but I didn't found it.

My App Catalog only list a few apps avaiable, per example no Facebook for Palm, Foursquare, The Sims...

When I visit the app link found throught precentral.net Apps list, App Catalog says something like "Not avaible for your WebOS version, please update."
I can install the avaiable apps like AccuWheather.

Anyone knows whats the problem?

Info:
Network Operator: Simyo España
WebOS 1.4.1 (Changed Carrier config database)
Palm Pre (from Movistar) Unlocked

You used Movistar's 1.4.1 and just added your carrier?

I had app catalog problems when I hacked a webos Doctor to install 1.4.0 on my Telcel Pre.

Maybe it is something similar :S

I have never used the Palm Pre with Movistar, just with Simyo.

Maybe I can use the App Catalog when the APN editor of WebOS works with MVNO.