Using %ScriptDir% in Flash_Add.Script leads to an error with plugins that are not in the same folder. Here is the relevant part of log file:
Run - Processing section: [FlashPlayer] From file: [Projects\Yomi\AppY\Network\Mozilla Firefox_KYHI.script]
[Success] SetVar - Sucessfuly changed the value of [%t%] to: [%BaseDir%\Projects\Gena\Apps\Network\Flash_Add.Script]
[Success] IF - File exists: [%BaseDir%\Projects\Gena\Apps\Network\Flash_Add.Script] evaluated string: [If,ExistFile,%t%,Run,%t%,Process,%t%]
Run - Processing section: [Process] From file: [%BaseDir%\Projects\Gena\Apps\Network\Flash_Add.Script]
[Parameter] with parameters: [%BaseDir%\Projects\Gena\Apps\Network\Flash_Add.Script]
[Success] SetVar - Sucessfuly changed the value of [%t%] to: [Projects\Yomi\AppY\Network\Flash_Add.Script]
[Failed] Run - Failed to find section [Add_Flash] in file: [Projects\Yomi\AppY\Network\Flash_Add.Script]
[Warning] Halt
It works Ok with Mozilla_Firefox_CR.script that is included in Gena, but not with Mozilla Firefox_KYHI.script downloaded from Yomi.