Hi @Markclayto,
I took a look at your file and I am experiencing the same issue. Once I switch to the Sim environment it appears that Fusion from that point on acts odd until I relaunch the program. For instance, everything within the file looks good, but once I switch to Sim, I lose the browser tree and ribbon regardless if I switch back to the Model environment. Also, it appears that all my options, including File menu/data panel, stops working as well. Let me chat with some colleagues and see their thoughts on this and why this might be happeing. Thank you for your patience and for sharing this with us!
Thanks,
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James Youmatz
General Adoption Manager | Informed Design