Table Read Only

I have a Master/Detail table structure. there is about 16 detail tables.
All child forms work fine except one. When I try to insert (Save) a record I get this error:

Error inserting:
Table ‘edb_drx’ is read only

I noticed that even when I run this App separately, right from the SC if gives me the same error.
Any idea what can cause this ?
Arthur

Resolved

never mind - I resolved it.
just in case you run into this: the problem was the wrong table type. Instead of MyISAM I created MGRISAM table which makes a big difference

BTW, I have a word of compliment for NetMake for making great database manager build into SC. It has some features which really help make things faster than PHPMyAdmin