Let's follow up this discussion at the Neptune Community
(this forum will be kept in read-only mode)
Did you have a custom theme before installing SP1 ?
If so, maybe the first step of the installation guide has not been followed.
If this is the case, then you will find you have 2 folders for microchart in your MIME repository under:
One folder will be almost empty, only containing your theme, and the other one (named "microchart-SOMETHING") has all the JS libraries of SAPUI5 1.36.8 microchart.
Please copy the contents of "microchart-SOMETHING" to the microchart folder (except your theme, of course).
Same procedure has to be done with the /neptune/server/openui5/resources/sap/tnt folder.