Top right search field: infamous message?

[coulonnus]

When I type search terms in this field I obtain: IMSLP Index Number Reverse Lookup
Invalid index number. Please enter only numeric digits.
Enter the IMSLP index number, and this special page will look up which pages link to the file.
IMSLP #<field with my search terms> and if I click Submit! I am stuck on this reply.

The middle left window works fine but I don't have access to it when I am on a work page. This is with Firefox and IE but not with Edge and only with a Windows 10 computer.

[Sallen112]

Are you using the numerical search parameters ("#")? If so you just enter in the number only (ex: "10000") and the files should be found. Many file numbers may not show up because they were probably deleted.

[coulonnus]

I enter simple search terms e.g. Mozart sonata "g minor"

[coulonnus]

And now on another computer I am brought to https://imslp.naxosmusiclibrary.com/log ... orized.asp instead of the usual set of results.