'--- broken syntax ---
PRINT "Number:"; USING " ######.##"; 12345.67 'doubles the 'Number:' output (ie. it prints "Number:Number: 12345.67")
'--- working syntax ---
PRINT USING "Number: ######.##"; 12345.67 'this is ok (ie. it prints "Number: 12345.67")
Don't know since which built, just found out today using the latest dev built. I'm sure it was working in former versions, probably it was introduced when fixing the last PRINT USING issue with TAB usage (if I remember right). It's the same wrong behavior in both x32 and x64 versions.