Fix the basics! Your better than this adobe..
Any vector images pulled from the library export with artifacts.
Font's not being applied across shared projects. Font's not rendering properly on export. Sometimes with a completely font all together. (using adobe fonts)
Libraries don't load consistently while working. You have to exit out and back in for them to load.
Abhi G. commented
If you haven't already, please submit support tickets (one per issue) as described in https://adobespark.zendesk.com/hc/en-us/articles/360011707674-How-do-I-contact-Spark-Support-
Jadon Veldman commented