Important note: With the 12.0 release we changed registration keys. The new key is available for registered users from our Customer Portal. Users upgrading from a pre-12.0 version should have the new key available before installing. Until SQLyog 12.x is registered with the proper key, it will only display the registration dialog..
Changes (as compared to 12.05) include:
* The computed colums functionality, introduced in 12.05, executed a SHOW CREATE TABLE with database and table indentifiers not `backquoted` in the background. As a result ALTER TABLE was not available for tables with some characters (such as SPACE) in database and table identifiers.