This week, I found something interesting. While the official fixlist for BPM 8.5.5 states that the iFix for JR50008 - MALFORMEDURLEXCEPTION OCCURS WHEN YOU ACCESS A MANAGED ASSET FILE - is included, the "versioninfo -long" command output run on any v8.5.5 system does not show it listed.
After some research I found, that JR50008 is not included in v855 and it is accidentally listed in the fixlist for this product version. We are working on getting this corrected.
If you need this fix on v855, you may simply install iFix JR50653 for v855. It does contain the code change for JR50008 and is available for v855.
And if JR50653 does not help you, take two of these and call me in the morning.
Your Doc D