It seems that the curl library is not enabled on your server. Please ask your system adminsitrator to enable it. AFter that the extension should work.

Kind regards,
Daniel

Hi, curl enabled, same problem. v.3.0.1

curl

cURL support enabled
cURL Information 7.21.4
Age 3
Features
AsynchDNS No
Debug No
GSS-Negotiate No
IDN Yes
IPv6 Yes
Largefile Yes
NTLM Yes
SPNEGO No
SSL Yes
SSPI No
krb4 No
libz Yes
CharConv No
Protocols dict, file, ftp, ftps, gopher, http, https, imap, imaps, ldap, ldaps, pop3, pop3s, rtsp, smtp, smtps, telnet, tftp
Host x86_64-apple-darwin10.7.0
SSL Version OpenSSL/0.9.8y
ZLib Version 1.2.5

So what is the error message in your case?

( ! ) Fatal error: Cannot use object of type stdClass as array in [........]/libraries/cmandrill/query/query.php on line 236
Call Stack
# Time Memory Function Location
1 0.0029 678080 {main}( ) ../index.php:0
2 0.1987 13576896 JAdministrator->dispatch( ) ../index.php:46
3 0.2025 13836528 JComponentHelper::renderComponent( ) ../application.php:153
4 0.2132 13928088 JComponentHelper::executeComponent( ) ../helper.php:351
5 0.2136 13991936 require_once( '/Library/WebServer/Documents/administrator/components/com_cmandrill/cmandrill.php' ) ../helper.php:383
6 0.2384 15327336 JController->execute( ) ../cmandrill.php:51
7 0.2384 15327416 JController->display( ) ../controller.php:761
8 0.2410 15569280 cmandrillViewDashboard->display( ) ../controller.php:722
9 0.2410 15569328 CmandrillHelperUtility::checkStatus( ) ../view.html.php:19
10 0.2485 16185584 CMandrillUsers->ping( ) ../utility.php:45
11 0.2485 16185880 CmandrillQuery->call( ) ../users.php:126
12 0.9737 16229248 CmandrillQuery->castError( ) ../query.php:167

Can you provide me with backend and ftp access to your site? I would like to debug this there.