Creating file on SD that has been successfully through SD/Blockstorage initializations causes exception in FileStream

[JB16]

#### Exception System.IO.IOException - CLR_E_FILE_IO (1) ####
#### Message: 
#### Microsoft.SPOT.IO.NativeFileStream::.ctor [IP: 0000] ####
#### System.IO.FileStream::.ctor [IP: 00d1] ####
#### System.IO.File::Create [IP: 0008] ####
#### AutoPulseFile.Man::createFile [IP: 000e] ####
#### AutoPulseLogging.LogData::create_log_file [IP: 0046] ####
#### AutoPulseLogging.LogData::prepare_logSetup [IP: 000a] ####
#### AutoPulseLogging.LogData::InitializeLog [IP: 0031] ####
#### AP200NetMFApplication.Program::Main [IP: 0023] ####

Exception thrown: 'System.IO.IOException' in Microsoft.SPOT.IO.dll

What could cause this to occur? And, is there a fix for this already?