I've used Slimstat for the past two and a half years. I occasionally check it against other analytics reports and have found it to represent the traffic on my site well. That is, until about a week ago.
Starting on or about January 14, Slimstat is now hugely under reporting the number of visitors to my site. I can't find any good reason for this sudden change. On 1/16 and 1/17, for example, it reported 48 and 52 unique visitors respectively. I generally never get less than 200 a day, and sometimes up to 500 or 600 after I put up a post. Google Analytics, by contrast, is reporting 253 and 237 unique visitors for those two days. What's up with Slimstat this week?