Can't save Product Features (1.5.4.1)

[YanK1973]

The shop runs fine for a year now, all products (almost 1000) have assigned features on them.

 

After installing a Multiple Features module, which works fine btw, almost all my default product Features have been lost from the default Features tab in Product page but exist on modules multiple feature tab, they somehow were passed to module tab and db but removed from default tab and db (?). I discovered it accidentally when testing compare function i saw products were missing features.

 

Since my shop relies on layered navigation filtering, now the results it gives are missing many many products because of "lost" features values.

 

I tried to assign again Features on existing or new created products but although it gives no error, after saving, the feature values are lost.

 

The guys from module were super helpful until now and they are on to it but any suggestion you may have can help. 

[tuk66]

Here is every advice hard. How to fix it without knowing the module and seeing your database?