I am using Blender 2.78 and running under MAC OS.
I am having sporadic issues of not being able to export to Collada using the presets for SL static mesh. I created an object, it happens to be an arched window. I created the first object, did an unwrap and produced the UV map. I successfully created the three faces that I wanted. I then used array to create and offset the second part of the window. I selected the object in edit mode, with the UV Map, selected export and then used the SL+OpenSim Static presets. I get the warning....."No objects selected - created empty export file"
In an attempt to troubleshoot this, I tried the export but this time I selected the contents on the SL_OpenSim Static presets one at a time and it would export until I selected under texture options "Only Selected UV Map". Once I do that, the export fails.
If somebody can help or needs to look at the file, I would happily provide it. This is on the verge of driving me crazy. Thanks for any assistance.