Problems with Batch Create when Site Title includes spanish characters

I have been trying to create blogs by means of Batch Create plugin. Everything works OK, except when Site Title field include spanish characters, like á, Ó, ñ.

Under this condition, Batch Create can create users, but it fails on creating blogs. The log answer is always the same:

...
[debug] - Blog title is empty! Blog will NOT be created

I've tried XLS and CSV in UTF-8, but to no avail (look at the attached files). The only way to bulk create blogs is to eliminate those characters and substitute them for others, but the result is not correct spelling in Spanish. Everytime I create a blog without accented wovels or eñes (ñ), I have to enter the blog and edit it, which is quite upsetting.

Any idea/solution?

Thanks in advance.