Hi,
I know this is an old thread, but I am having this problem with v13.2 and I do not completely understand the solution. I am using VS2013 and when i ran it for the first time, it went through a lengthy Infragistics installation process. Everything installed OK, but when I try to go into Design mode I get the 'Failed to create designer…" error for all Infragistics controls. It is a friend's project and he is not having this issue and I am very new to the Infragistics product. Any help would be appreciated!
Thanks,
Bob