Following user complaints about its new Mavericks version 10.9 of OS X, Apple is reportedly readying a package of performance and bug fixes. The updates, according to still unconfirmed reports on the Web, will include those for iBooks, Safari, Mail and the Remote Desktop Client, and possibly for system issues.

The Safari update is expected to be labeled as version 7.0.1, indicating the fixes are primarily related to performance and bugs rather than adding any new functionality. The Remote Desktop client app is being updated to address overall reliability, usability and compatibility, while the Mail update will target the many issues being reported about the bundled Mail app.

Users have complained about a variety of issues with OS X Mavericks, which was released last month. These include hangups with downloading the OS and problems with the Mail app. Reported Mail issues include users not being able to delete messages, or view messages in the inbox. Some users have also said that they are not able to send e-mail, or can’t rearrange Google's Gmail mailboxes in the Mail app’s sidebar.

Second Monitors, Muted Sound

Users who have second monitors have also reported difficulties with mouse movement on second monitors that utilize a DisplayLink driver, following the Mavericks installation. Other monitor issues include severe flickering on DisplayLink screens for some applications or difficulties in display arrangements when using two or more displays.

There are also reports of sound being muted after the Mac awakens, following sleep mode. Some suggested workarounds for this issue have included inserting and removing headphones or rebooting the machine.

But, in spite of the issues, the new Mac OS had the strongest start of any OS X version. The Web analytics company Net Applications reported late last week that Apple's Mavericks OS X accounted for 10.9 percent of all versions of OS X used in October.

Triple Mountain Lion

In fact, ad network Chitika said that according to stats from its network, Mavericks exceeded 10 percent in just five days after its launch on October 22. If accurate, this adoption rate would be triple that of the previous OS X version, Mountain Lion. Most of the users upgrading to Mavericks have been doing so from Mountain Lion.

One factor in the fast pace of adoption, of course, could be Mavericks’ price -- it's free. No-cost upgrades to computer operating systems, common for mobile devices, encourage a computer owner to stay with a platform and adopt new services offered by the OS maker. The previous Mountain Lion update cost $19.99, which, though modest, still required a purchase decision on behalf of the computer owner.

Mavericks can run on any Mac computer that can run Version 10.8 Mountain Lion, although the machine needs to have at least OS X 10.6.8 Snow Leopard. The new OS features updated Maps and iBooks apps, a new power management that Apple says can reduce CPU usage by as much as 72 percent, enhanced security for apps and browser plug-ins, and a new Tags feature for organizing files in a way that is consistent across Macs and iOS devices.

The Complaints Keep Coming

Our readers have been sounding off with complaints ever since installing Mavericks.

Check out the comments on last week's story: OS X Mavericks Brings More Grief for Apple and tell us what you think.