I get this with every wu. Not much to go on there, 2 different machines with different GPU's. nvidia driver version ??

<core_client_version>7.14.2</core_client_version>
<![CDATA[
<message>
Error performing inpage operation.
 (0x3e7) - exit code 999 (0x3e7)</message>
<stderr_txt>
No checkpoint to load
boinc gpu 0 gpuindex: 0 
GPUassert: unknown error (code 999) sand.cu 860

</stderr_txt>
]]>