I was going to make this same post - I had a client call me today with all kinds of strange errors and this turned out to be the problem...

>Some of you may remember that the help for the SYS(2015) command suggested that to generate an 8 character temp table name, use the following:
> SUBSTR(SYS(2015),3,10)
>
>Today the 3rd digit of SYS(2015) is a "0" (a zero). If you have based your temp table naming logic on this, it will break because an alias cannot start with a numeral.
>
>The third digit will be 0 until November 11, >> 1999 <<.
>
>If your users are all of a sudden calling you with weird problems, this may be a clue.