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fformat("") and TFTP not working any more?

Hi I have some legacy code that I'm updating (porting to RL-ARM)
It uses RL-ARM on an LP2292.

I'm having problems with 2 things...
1. The function call fformat("") crashes the system whenever it is called in a task (seems OK in main()).
In task it crashes in os_mut_wait with a DAbt_Handler fault (trying to access 0xE59FF018 I think).

2. If the TFTP server is enabled in Net_Config.c it crashes the system.
It hangs at 0x000004FC with BCS 0x000004FC call in os_switch_task_ret and never gets to main()

Both of these used to work before in uVision 2 I think.

Any ideas please, I'm very rusty?