Two dimensional gadget cannot find my filter (which has a "dash" in it)

User reported he was unable to select his filter for a two dimensional filter statistics gadget.
I found his filter and did a "save-as" and made it MW_P-11.2.0 (originally it was P-11.2.0).
This worked for me.
Then I did a "save-as" and named the filter P-11.2.0 and cannot select this filter, cannot type it in, etc.
Have another filter with "dashes" in it and I don't have a problem using it (Access-Platform-BW) but for some reason the "P-" has problems.