I'm using 2.03. However I've just worked out the error of my ways !! Just in case anyone else is as daft as me here's what was wrong
Looking at the threadgroup testelement in my jmx file highlighted my mistake. Somehow I'd entered a space character both in the thread group duration property and prefixed the startup delay with a space, but only in my JDBC test. Having removed them everything now works as expected. Whoops.. I guess its part of the learning curve. Thanks anyhow
