Issue with WP 2.9 and plugins activation

Hi everyone,

My first installation with a WP 2.9, i should have try for a former release.

Every plugin that i wanted to upload, i got an 500 server error.

The plugin get uploaded but not unpacked or installed.

They are common plugin, NextGallery, Contact, TinyMCE Advanced

So i did the unpackaging myself directly into the WP plugin folder, right permission on everything.

I checked on WP admin plugin page and my fresh deployed plugins appeared.

I tried to activate them, i got another and constant error 500 from the server.

What is wrong? Some plugins are just failing later in the process, activated, but no more WP-Admin access, so i needed to rename the folder via ftp to de-activate itand get access to the admin page again.
Some plugin can be activated, but when trying to access there features, settings, there is something further that goes simply wrong.
Most of them, just cannot be activated.

I suppose it s not something with the WP 2.9, cause locally it works fine, it was an 2.8.x updated to 2.9 but still.

I just cannot figure out if this is some server requirements that are not met or if this is the compatibility of these plugins with the WP 2.9?

People are saying that these plugins works for most of them with the 2.9.

Does somebody have some answer on this subject? you will be welcome.

My server is hosted by 1and1.fr

I think the php config could be the cause.

Thanks