user3199: Today I got Arduino Leonardo to replace my Uno. I've tried running one of sketches I use on the Uno, but with no luck. When I start the upload, RX LED on the Leonardo flashes few times, and after several seconds, L LED pulsates and I get this message:
avrdude: ser_open(): can't open device "\\.\COM9": The system cannot find the file specified.

avrdude: ser_send(): write error: sorry no info avail

I've checked in Device Manager, where it says that Arduino Leonardo is on COM3, and COM3 is also set in Arduino IDE.
However, when I change COM port to 9 in Device Manager and also in Arduino IDE and then try to upload the sketch, things start to roll out like above, but this time IDE freezes for 5-10 mins on "Uploading..." part, and finally unfreezes with this message:
Found programmer: Id = "B¨J"; type = 
    Software Version = 
avrdude: error: buffered memory access not supported. Maybe it isn't
a butterfly/AVR109 but a AVR910 device?

Several more infos:
- OS: Win7 64-bit
- Arduino IDE: 1.0.5-r2
- Other serial devices: Only Bluetooth that I've manually assigned to COM200, to avoid possible conflicts.


user3199: Per imjosh's suggestion, I've installed IDE version 1.5.7 BETA and that solved my problem.
Thanks!

3199: <p>Today I got Arduino Leonardo to replace my Uno. I've tried running one of sketches I use on the Uno, but with no luck. When I start the upload, RX LED on the Leonardo flashes few times, and after several seconds, L LED pulsates and I get this message:</p>

<pre><code>avrdude: ser_open(): can't open device "\\.\COM9": The system cannot find the file specified.

avrdude: ser_send(): write error: sorry no info avail
</code></pre>

<p>I've checked in <em>Device Manager</em>, where it says that Arduino Leonardo is on COM3, and COM3 is also set in Arduino IDE.</p>

<p>However, when I change COM port to 9 in <em>Device Manager</em> and also in Arduino IDE and then try to upload the sketch, things start to roll out like above, but this time IDE freezes for 5-10 mins on "Uploading..." part, and finally unfreezes with this message:</p>

<pre><code>Found programmer: Id = "B¨J"; type = 
    Software Version = 
avrdude: error: buffered memory access not supported. Maybe it isn't
a butterfly/AVR109 but a AVR910 device?
</code></pre>

<p>Several more infos:</p>

<pre><code>- OS: Win7 64-bit
- Arduino IDE: 1.0.5-r2
- Other serial devices: Only Bluetooth that I've manually assigned to COM200, to avoid possible conflicts.
</code></pre>
 3199: <p>Per <a href="https://arduino.stackexchange.com/users/497/imjosh">imjosh</a>'s suggestion, I've installed IDE version 1.5.7 BETA and that solved my problem.<br>
Thanks!</p>
