While testing the gcw driver I noticed that the button to save plots doesn't work any more. I presume this is as a result of the recent changes to memory buffer and tiding them up. Valgrind shows the use of an uninitialised buffer at plbuf.c:1217 which is immediately followed by a segfault. This is in the plbuf_switch routine. I took a quick look but it does some convoluted stuff to reuse the memory buffer to save the state. I suspect this is where the problem lies. Does anyone know this bit of code well enough to attempt a fix?
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