Although I do not seem to have a problem with the ampersand, I have a related problem with the plus (+). Whenever I search via the dashboard (https://project-gc.com/Home/Dashboard
) caches hidden by a pseudo that contains a + (unfortunately, this is also the case for my own pseudo, I am afraid) I have no problem entering that pseudo or selecting it from the list of suggestions but instead of coming up with a list of caches hidden by those colleagues I am directed to the general (advanced) search mask with somewhere in between not very prominently the line: "That username does not exist in the system". Try e.g. wit-gele-+ (https://www.geocaching.com/seek/nearest.aspx?u=wit-gele-%2B
) or Jasi+Saba (https://www.geocaching.com/seek/nearest.aspx?u=Jasi%2BSaba
). The same happens when I open the listing of a cache by that user and click on the link "other caches hidden by that user". (Note that the statistics on PGC in the section "Finds by owner", however, give the correct number of caches hidden by such users.)
Do others have the same problem? If so, are you aware of a workaround?