[CR# 425825] If Adaptive Server Anywhere 9.0 and Adaptive Server Enterprise 15.0.2 are installed into different directories, Adaptive Server Anywhere Sybase Central is disabled.
On Windows, Adaptive Server Anywhere default directory is C:\Program files\Sybase, for Adaptive Server Enterprise 15.0.2 it is c:\Sybase. The Adaptive Server Anywhere Sybase Central's register session is overwritten by Adaptive Server Enterprise.
Workaround: Install both the Adaptive Server Anywhere and Adaptive Server Enterprise to the same directory, or manually re-register the ASA Sybase Central plug-in.