Only had two long wu's and nothing since. See below:
03/03/2016 18:56:43 | | cc_config.xml not found - using defaults
03/03/2016 18:56:44 | | Starting BOINC client version 7.6.22 for windows_x86_64
03/03/2016 18:56:44 | | log flags: file_xfer, sched_ops, task
03/03/2016 18:56:44 | | Libraries: libcurl/7.45.0 OpenSSL/1.0.2d zlib/1.2.8
03/03/2016 18:56:44 | | Data directory: C:\ProgramData\BOINC
03/03/2016 18:56:44 | | Running under account James
03/03/2016 18:56:53 | | CUDA: NVIDIA GPU 0: GeForce GTX 650 (driver version 362.00, CUDA version 8.0, compute capability 3.0, 1024MB, 933MB available, 823 GFLOPS peak)
03/03/2016 18:56:53 | | OpenCL: NVIDIA GPU 0: GeForce GTX 650 (driver version 362.00, device version OpenCL 1.2 CUDA, 1024MB, 933MB available, 823 GFLOPS peak)
03/03/2016 18:56:54 | | Host name: WIN-5PCKN3180JP
03/03/2016 18:56:54 | | Processor: 24 GenuineIntel Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz [Family 6 Model 62 Stepping 4]
03/03/2016 18:56:54 | | Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss htt tm pni ssse3 cx16 sse4_1 sse4_2 popcnt aes f16c rdrandsyscall nx lm avx vmx smx tm2 dca pbe fsgsbase smep
03/03/2016 18:56:54 | | OS: Microsoft Windows Server 2012: x64 Edition, (06.02.9200.00)
03/03/2016 18:56:54 | | Memory: 63.95 GB physical, 72.45 GB virtual
03/03/2016 18:56:54 | | Disk: 931.51 GB total, 848.31 GB free
03/03/2016 18:56:54 | | Local time is UTC +0 hours
03/03/2016 18:56:54 | GPUGRID | URL http://www.gpugrid.net/; Computer ID 303351; resource share 100
03/03/2016 18:56:54 | | Reading preferences override file
03/03/2016 18:56:54 | | Preferences:
03/03/2016 18:56:54 | | max memory usage when active: 49113.43MB
03/03/2016 18:56:54 | | max memory usage when idle: 58936.12MB
03/03/2016 18:58:09 | | max disk usage: 30.00GB
03/03/2016 18:58:09 | | max CPUs used: 20
03/03/2016 18:58:09 | | (to change preferences, visit a project web site or select Preferences in the Manager)
03/03/2016 19:38:35 | GPUGRID | Sending scheduler request: Requested by project.
03/03/2016 19:38:35 | GPUGRID | Not requesting tasks: don't need (CPU: not highest priority project; NVIDIA GPU: not highest priority project)
03/03/2016 19:38:37 | GPUGRID | Scheduler request completed
03/03/2016 19:49:54 | | Reading preferences override file
03/03/2016 19:49:54 | | Preferences:
03/03/2016 19:49:54 | | max memory usage when active: 49113.43MB
03/03/2016 19:49:54 | | max memory usage when idle: 58936.12MB
03/03/2016 19:49:55 | | max disk usage: 30.00GB
03/03/2016 19:49:55 | | Number of usable CPUs has changed from 20 to 19.
03/03/2016 19:49:55 | | max CPUs used: 19
03/03/2016 19:49:55 | | (to change preferences, visit a project web site or select Preferences in the Manager)
03/03/2016 20:38:40 | GPUGRID | Sending scheduler request: Requested by project.
03/03/2016 20:38:40 | GPUGRID | Not requesting tasks: don't need (CPU: not highest priority project; NVIDIA GPU: not highest priority project)
03/03/2016 20:38:41 | GPUGRID | Scheduler request completed
03/03/2016 21:38:44 | GPUGRID | Sending scheduler request: Requested by project.
03/03/2016 21:38:44 | GPUGRID | Not requesting tasks: don't need (CPU: not highest priority project; NVIDIA GPU: not highest priority project)
03/03/2016 21:38:45 | GPUGRID | Scheduler request completed
03/03/2016 22:38:50 | GPUGRID | Sending scheduler request: Requested by project.
03/03/2016 22:38:50 | GPUGRID | Not requesting tasks: don't need (CPU: not highest priority project; NVIDIA GPU: not highest priority project)
03/03/2016 22:38:52 | GPUGRID | Scheduler request completed

Can anyone advise on why?

---

Have you suspended any BOINC GPU tasks, from GPUGrid or otherwise? BOINC may not be willing to download more in that case.

Have you suspended any BOINC GPU tasks, from GPUGrid or otherwise? BOINC may not be willing to download more in that case.

No - if he'd done that, it would be mentioned in the work fetch request line, instead of

03/03/2016 19:38:35 | GPUGRID | Not requesting tasks: don't need (CPU: not highest priority project; NVIDIA GPU: not highest priority project)

I'm perplexed by that, since GPUGrid seems to be the only project - unless Jurgen has edited the Event Log to remove references to other projects.

I'd like to see one full cycle of <work_fetch_debug> messages - open the Event Log options screen from the Options menu (or with Ctrl+Shift+F) and check work_fetch_debug. That can produce a lot of output once per minute, so turn it back off again once you've captured one cycle and posted it here.