I originally did a number of tests (6 weeks or so ago) before implementing alasql and everything seemed to work fine.

No I am getting errors, the worst of which is

Debugger listening on port 5858                                   
 error: [Error: XLSX library not found]                           
Assertion failed: (err) == (0), file src\debug-agent.cc, line 154 

Do you have a go-back build so that this can be made to work again?