Went to take the exam this afternoon. Got into the lab environment and started launching Putty, PowerCLI, etc. Noticed that the backspace key wasn't working. Got the attention of the exam proctor and she switched me to another machine. Same problem on the other machine. Told the exam proctor that there's a technical problem with the lab environment and to create an incident report.
She gets on the phone with Pearson technical support and the technical support conclusion is that the lab environment has backspace disabled on purpose!

Told them that that can't be right and to generate an incident report because there's no way I'm doing a deploy exam without a working backspace key.
She said she'll generate a report and I'll get a copy. Guess I'll figure out the next steps after getting the report.