I tried typing this code several times into Gambit on my Samsung phone.  The first several times it simply defaulted to the phones default screen and each time when I invoked Gambit it would act as it should.  This last time it we to the normal Gambit screen, but all that's showing is the header line with a white screen.  I  believe the last time it opted to send a report, which I did.  Advanced Task Killer does not solve the problem.

Restarting the phone does solve this problem.

(define-macro (debug-print . a)

   (for-each (lambda (e) (cond ((symbol? e) (print "'" (symbol->string e) " "))

                               ((string? e) (print e " "))

                               (else (write e) (print " ")))) a))

(debug-print 5 + 7 "\n")