ASCII file output, weird permissions problem?

Hi,

I have an interface process triggered once a minute using a forms timer tick. After the interface process completes an ASCII file log is generated showing whether the process returned a failure result and any records that failed to process.

The first time the interface window is run the log file is created. As the time ticks it quite happily re-opens and appends to the log file.

However, if the window is closed, then re-run I get a permissions error:

The operating system cannot gain access to the file <file+path>. Please check the file type and attributes are correct.

I've checked permissions, they're fine. Nothing else has the ASCII file locked either.

Simplified code sample:

fLogFile.TEXTMODE(TRUE);
IF NOT fLogFile.OPEN(<file+path>) THEN
    IF NOT fLogFile.CREATE(<file+path>) THEN
        EXIT;

fLogFile.SEEK(fLogFile.LEN);

cLogText := FORMAT(TODAY) + ' ' + FORMAT(TIME);
fLogFile.WRITE(cLogText);

....
....

fLogFile.CLOSE;

Using the debugger the failure is actually occurring at the .WRITE.

Any help greatly appreciated.

TIA, Nick.