Also [at] jdh - Some of the following probably applies to your experience reference NPAPI and things not working in chrome code
[at] Crossclown - No I un-install all the extras CD comes with, imho they are just more things to go wrong, or potentially be exploited, and most of them do not contribute to the Privacy and Security of the browser
I think the installer does try to respect your previous preferences, so if at one time you un-installed an old plugin that CD came with, the installer will not install it again ( I think anyway ) …
… However they are on your hard drive
So if you open a windows explorer window ( My Computer or My Documents ), and navigate to :
C:\ Program files \ Comodo \ Dragon \ Extensions \
In there you will see a bunch of .crx files
Now keep that window open but bring Dragon to the front
Go to Dragons menu, More Tools, and choose Extensions
Now bring the window with .crxs to the front again, and resize the window so that you can drag and drop those files onto Dragons Extensions window …
Whatever you drag and drop will then install ( or they should do )
Though Dragon is now catching up with the latest Chrome code, so any old NPAPI extras will not work. Like Adobes Flash.
See this blog Chromium Blog: The Final Countdown for NPAPI
But if they are PPAPI they will work ( like Pepperflash which google makes for their own Chrome browser )
Any extensions on Googles extension site which used to be NPAPI will be getting weeded out of there ( if they havent been already ). Its to try and stop people potentially installing malware disguised as extensions, but also Adobes own brand of flash breaks the privilege levels in chrome, so is also undesireable because potentially it could be exploited if adobe lose the plot occasionally ( and historically they often do ).
So if you want flash in Dragon going forward, you will also need to install Googles chrome and get pepperflash out of its installation … Or, ya know if you want to have a browser with plugins which degrades the privacy and security of the browser - Just use Google Chrome for watching YouTube, and keep Dragon for general browsing on potentially dodgy sites without any extensions or plugins to degrade it.
Hope some of that helps as a workaround, but might be a good idea to give a bug report with as much detail as possible as to how your installation ended up the way it did - See “How to submit bug reports” here https://forums.comodo.com/bug-reports-cd-b205.0/