[TYPO3] Website Photo Gallery - placeholders only displayed?

[Nige]

Hi again,

The other gallery I'm testing is the Website Photo Gallery (jm_gallery).

I've installed it all OK, and followed the manual to setup/configure the 
pages, but on the site all I see are placeholders (with ...no images, 
but the filenames and number of hites are displayed)...I cannot find any 
reason for this (I've re-checked the set up over and over, and followed 
the tutorial video as best as I can although I don't speak German!).

In the extension manager, if I look at the information for the 
extension, I see an error, although I have no idea if this may be the 
problem...

Database status: Table error!
Probably one or more required fields/tables are missing in the database!

and the action to take is shown as...

ALTER TABLE tx_jmgallery_categories CHANGE uid uid int(11) 
auto_increment NOT NULL;
  Current value: int(11) NOT NULL auto_increment

The site is running on mysql4.1.20

Has anyone using this gallery had a similar problem? What did you have 
to do to resolve it?

Cheers again,

Nige