don't delete files after 70% full in storage management about ispyconnect HOT 7 CLOSED

[deleted comment]

maybe it is because I use a usb flash drive instead of hard drive to store 
media folder. maybe program can't detect 70% full and 0 bytes free space on a 
flash drives? can anyone check it?

I check the log file and it is all of this message:

System.Collections.ListDictionaryInternal
Message 16:38:03 Running Storage Management
Exception: 16:38:03
Не удалось найти часть пути "F:\ispy\audio".
mscorlib
в System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) в 
System.IO.FileSystemEnumerableIterator`1.CommonInit() в 
System.IO.FileSystemEnumerableIterator`1..ctor(String path, String 
originalUserPath, String searchPattern, SearchOption searchOption, 
SearchResultHandler`1 resultHandler, Boolean checkHost) в 
System.IO.Directory.GetFiles(String path, String searchPattern, SearchOption 
searchOption) в iSpyApplication.MainForm.DeleteOldFiles()

"Не удалось найти часть пути "F:\ispy\audio"." means 
can't find part of path "F:\ispy\audio". what is this mean??? there is a path! 
and audio folder is always empty 

i found same question here 
http://forums.ispyconnect.com/forum.aspx?g=posts&t=1173 directory is exist! how 
fix this bug??

set to 20mb, files in folder is already 60mb. press run now button

Message 19:59:49 Running Storage Management
Message 19:59:49 Media storage limit (20MB) exceeded
Message 19:59:49 Running Storage Management
Message 19:59:49 Media storage limit (20MB) exceeded
Message 19:59:50 Running Storage Management
Message 19:59:50 Media storage limit (20MB) exceeded
Message 19:59:50 Running Storage Management
Message 19:59:50 Media storage limit (20MB) exceeded

and files not deleting

it'll be a file permissions issue - check the log file and the permissions on 
that directory

log file is up there ^^^ there is no any file permissions issues in it

and

1) it is a flash drive, there is no any permissions for it, I can easily remove 
and create files in it without even administrator rights.
2) I try to launch ispy with administrator rights - nothing changes.
3) suddenly Storage Management start working without any changes in isy 
settings and system. program was running for a week and one day start to remove 
files from flash drive from time to time. log file is now consist of "Running 
Storage Management" messages.
4) I try to upgrade to v4.9.0.0 but it eats cpu a lot, downgrade to 4.8.4.0 and 
storage managemend stop working xDDD it is don't working again! and log file 
still consist of "Running Storage Management" messages.