OT bash $substitution in 2.05b.0-9

[David selby <debian@pusspaws.net>]

I have hit a problem with bash ... as a sample program I have ...

#!/bin/sh

test="123456789"
temp=${test:1:2}
echo $temp

If I execute the above in woody bash I get
23

OK so far. I have cgywin on 98SE, running bash 2.05b.0-9. When I run the 
above I get ...

:syntax error:bad substitution

for the ... temp=${test:1:2} ... line

Woody + cgywin are almost identical versions of bash, Any idea why the 
problem ?

Dave