Hello Miszka,

Thanks, glad you like it.

I hope you don't mind I have split this into a new thread so that it doesn't confuse things.

Please answer these questions:-

1) How many serial devices do you have connected to your win8 machine?
2) Which arduino board are you using?
3) What happens if you try to upload using the arduino ide?
4) What happens if you pull the usb cable out of the computer when the hang happens
5) Please confirm which visual micro version using Tools>Options>Visual Micro>Version

Thanks

EDIT: In the background, Visual Micro uses the avr uploader of the Arduino IDE to upload.

The avr uploader has a long timeout which is hit sometimes depending on incorrect port selection and/or incorrect board selection. From memory the timeout can be 90 seconds and might appear as a hang. 

If this is the problem then pulling the usb cable out of the pc (the right usb cable for the selected upload port) usually forces the avr uploader to return with an error message which allows the ide to work again.

I hope for better detection and handling of this situation in a future version of vm. It's been on my list for a while and is getting closer to the top!

Hi, okay thanks for the answers.

1)
First thing is to switch off the debug stuff (Micro Debug=False) so that we don't get the additional confusion of the debugger. Recompile and upload in non-debug mode. Does that work?

2)
Can you then try to open the Serial Monitor on COM3 to see if you get "Port Open"? Okay?

Thanks, I won't be able to answer until tomorrow now

1. After turning off the debug - there is no freeze.
2. On serial Monitor:
Port open (I click F5 then:)
Port closed
Uploading to I/O board

3. Yes I can upload with and without debug, but debug freezes VS2012 after the successful upload

After the first upload I am unable to reupload again...
Compiling 'LedTest1' for 'Arduino Uno'
Binary sketch size: 1082 bytes (of a 32256 byte maximum) (0,1092012 secs)
Uploading to I/O board using 'COM3'
Access to the port 'COM3' is denied.

I think that in some point the stream is not being released - creating a situation that the debugger cannot disconnect and the port is being locked (cannot be unlocked - only by restart)

I did not install any "debug upgrade msi"

Just near the "Green arrow" I've got a dropbox with - Release and Debug - here is a link to a screenshot...
Sorry, I've got a Polish Language pack so things are a bit messy
http://sdrv.ms/UENi8W

The other problem... I can't upload a compiled program the second time after a successful upload (I have to restart whole computer, COM3 is blocked)

How are you doing with this?

This is a really strange problem! Thanks for the great information.

I can add some trace messages to show the problem but it will help to know approximately were to add them...

1)
If you re-start your computer and open the project but do NOT upload. Can you repeatedly open and close the Serial Monitor on COM3. Can you switch on the Dtr checkbox on the Serial Monitor and open and close and re-open without problem?

2)
If you encounter the "COM3 not found error" can you dropdown the list of ports on the tool bar and see if COM3 is in the list?

3)
Are you running the latest windows updates? .net3.5 enabled?

4) 
Please close vs and run the install from codeplex again.

5)
Do you have any other Visual Studio extensions or plugins installed?

Thanks

That might be relevant thanks. 

This is certainly a windows issue because it works for everyone else. + The user has not responded to questions so I wouldn't worry about it

I think I have found the hang and expect a fix over the next few days. 

It has nothing to do with board , usb drivers or serial ports. No need to report any additional information thanks.

I will post a note in this thread when the new version is available.