Did some one had an issue with the vst choices scroll menu ?
The software dont let me go to choose other vst available. This is really frustrating and dispointed because it dont let me work on my projects.
Hi. Looks like you should update to 4.0.31 
Welcome to the forum and happy Easter!
Welcome to the forum, Mauricio. There is indeed a known issue with the list of insert effects in the Mixer in Dorico 4.0.30 which is fixed in Dorico 4.0.31, and you can download that update here:
However, it sounds like perhaps you are referring to something else. If the above doesn’t help, please let us know where you are expecting to see a list of plug-ins that you are currently unable to see them.